在 Bash 中充分利用这一点可以增加程序的灵活性。例如:create_user && make_home_directory这条语句,只有 create_user 返回 0 时,才会执行 make_home_directory。而create_user; make_home_directory则表示无论 create_user 的返回值是什么,都会执行 make_home_directory。类似的,你也可以通过:create_user |...
So I wrapped all the npx calls into a function and I called that function instead, like this:#!/bin/sh generate_book () { npx honkit pdf ./ ../books/$(basename $PWD).pdf npx honkit epub ./ ../books/$(basename $PWD).epub npx honkit mobi ./ ../books/$(basename $PWD).mobi ...
# Basic bash function definition and execution from a shell terminal [me@linux ~]$ fn() { echo "Hello World!"; } [me@linux ~]$ fn Hello World! ⚠️ When using the curly braces {} notation, make sure to separate the content of the function and the braces with blanks or newlin...
例如封装编译内核的命令,实现任何目录下都可以直接编译,我们总需要先cd到内核根目录,再make编译,最后再cd回原目录。例如: Copy aliasmkernel='cd ~/linux ; make -j4 ; cd -' 这样会导致,在编译过程如果Ctrl + C取消返回时,你所处在的目录就变成了~/linux。这种情况下,使用( list )就能解决这问题,甚至都...
5. Make an initial backup to create a baseline You may need to perform the function testing several times. The first time you run it, you will likely find some errors in your scripts or in the procedures. Therefore, to avoid wasting too much time in recreating the server environment from...
比如我们可以向容器中的应用发送一个重新加载信号,容器中的应用程序在接到信号后执行相应的处理程序完成...
While ShellCheck is mostly intended for interactive use, it can easily be added to builds or test suites. It makes canonical use of exit codes, so you can just add ashellcheckcommand as part of the process. For example, in a Makefile: ...
11. if [ [ a = b ] && [ c = d ] ]; then ... 不要用把 [命令看成 C 语言中 if 语句的条件一样,它是一个命令。 如果你想表达一个复合的条件表达式,可以这样写: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 if[a=b]&&[c=d];then... ...
$ a=10; function b() { a=2; }; b; echo $a 执行结果为2 即:函数b里对a进行修改后,a的值就发生改变。 如果不想b对a的操作不影响全局的值,可以将b中的a设为局部变量。 如下所示: $ a=10; function b() { local a=2; }; b; echo $a ...
cd /net || { echo "Can't read /net. Make sure you've logged in to the Samba network, and try again."; exit 1; } do_stuff more_stuff 注意,在{号和 echo 之间需要有一个空格,同时}之前要加上分号。 顺便提一下,如果你要在脚本里频繁改变当前目录,可以看看 pushd/popd/dirs 等命令,可能你...